Foaming??

The first bite or 2 that I eat always gets semi stuck and I start foaming and then spit stuff up. After about 20 minutes it is better and I can eat-- The bites do not get stuck then. Anyone know why?? and how to get rid of it?? My theory is that the pouch is dry and when you eat it stimulates the digestive saliva in the esphogus it secretes so much that you get stuck, after a while it stops and then the pouch is primed so to speak and that is why the rest of the food goes down so easily. It keeps me from getting another fill although I think I can eat too much in the evening and just about right for breakfast and lunch. I am also only losing about 4.5 pounds a month. Jill